Secure Continuous Variable Teleportation and Einstein-Podolsky-Rosen Steering
2015; American Physical Society; Volume: 115; Issue: 18 Linguagem: Inglês
10.1103/physrevlett.115.180502
ISSN1092-0145
AutoresQiongyi He, L. Rosales-Zárate, Gerardo Adesso, M. D. Reid,
Tópico(s)Quantum Computing Algorithms and Architecture
ResumoWe investigate the resources needed for secure teleportation of coherent states. We extend continuous variable teleportation to include quantum teleamplification protocols that allow nonunity classical gains and a preamplification or postattenuation of the coherent state. We show that, for arbitrary Gaussian protocols and a significant class of Gaussian resources, two-way steering is required to achieve a teleportation fidelity beyond the no-cloning threshold. This provides an operational connection between Gaussian steerability and secure teleportation. We present practical recipes suggesting that heralded noiseless preamplification may enable high-fidelity heralded teleportation, using minimally entangled yet steerable resources.
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